Web Reference: This query returns every city document where the regions field is an array that contains west_coast or east_coast. From the example data, this includes the SF, LA, and DC documents. Mar 4, 2019 · Firestore introduced the whereIn, arrayContains and arrayContainsAny methods in late 2019. These methods perform logical 'OR' queries, but have a limit of 10 clauses you can pass in (so max 10 vitamins you can search for). Dec 4, 2025 · In this guide, we’ll explore how to effectively query Firestore documents with array fields, focusing on finding users with specific photo IDs. We’ll cover core Firestore array query operators, provide step-by-step examples, and share best practices to avoid common pitfalls.
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